JPH05252851A - Net extend device and trawl fishing equipment using the same - Google Patents

Abstract

PURPOSE:To ensure the attack angle against water to be set and retained without the need for using a bridle wire, the handling to be highly easy, the net extending force to be freely controlled from the deck, also the expansion width of the net opening of a towing net to be regulated properly according to the purpose of fishery. CONSTITUTION:The objective net extend device 15 is a bag-shaped form using a flexible member having an opening at its upstream end, and has an underwater wing 16 coming to a wing-shaped virtually rigid body form owing to the water entered via the above opening. The objective trawl fishing equipment is also a bag-shaped form using a flexible member having an opening at its upstream end, being located at a specified position close to the upstream end of a towing net 1 and a further upstream side therefrom, and provided with the above-mentioned net extend device 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible expansion net and a trawl fishing gear provided with the expansion net.

[0002]

2. Description of the Related Art Generally, a large-sized and standard otter board is widely used for expanding the net opening of a drag net.

However, since the otter board is heavy and difficult to handle and is dangerous to work, a net-like body made of a flexible material such as canvas is attached to the dragnet. , The net mouth is expanded.

This flexible netting body is formed by a canvas material in the shape of a kite, and its downstream end is fixed to the dragnet, and its upstream end is fixed to the downstream ends of many bridle wires. Attached to the dragnet. When the towing of the dragnet is towed, the expansion net body receives a water flow on the inner surface side thereof, maintains an angle of attack against water determined by the length of the bridle wire, and expands the net mouth of the dragnet.

[0005]

However, it is necessary to dispose a large number of bridle wires in order to provide an angle of attack at the water in the expansion body, and the bridle wires are used when the net is lifted or on the deck. Occasionally, it may be entangled with a dragnet or other fishing gear, and it is also necessary to adjust the length of each bridle wire in order to adjust the angle of attack against water, which is an inconvenient task.

The present invention has been made in view of these points, and the angle of attack against water can be set and maintained without using a bridle wire, which is extremely easy to handle and can freely expand the net from the ship. It is an object of the present invention to provide a net-expanding body and a trawl fishing gear that can adjust the opening angle and can appropriately adjust the expansion width of the net mouth of the dragnet according to the purpose of fishing.

[0007]

In order to achieve the above-mentioned object, the expansion body of the present invention is formed into a bag shape having an opening at the upstream end by a flexible member, and the water flowing in through the opening is formed. It is characterized by having a hydrofoil portion having a substantially rigid wing shape.

Further, the expansion net body is characterized by having ribs for holding the wing-like substantially rigid body shape of the hydrofoil portion and a stabilizer for holding the water attack angle of the hydrofoil portion.

Further, the trawl fishing gear is formed in the shape of a bag having an opening at the upstream end by a flexible member in the vicinity of the upstream end of the dragnet and at a predetermined position on the upstream side thereof,
It is characterized in that an expansion net body having a hydrofoil portion having a substantially rigid body shape is arranged by water flowing in through the opening.

[0010]

According to the present invention, when the hydrofoil portion of the expansion member made of a flexible member is put into water together with the dragnet, water flows into the inside through the opening at the upstream end, and It becomes a substantially rigid body, and when it receives a water flow, it will exert a net expansion force. Further, the stabilizer automatically sets and holds the water attack angle of the hydrofoil, and the opening of the dragnet is sufficiently widened. Then, by adjusting the feeding length of the lifting rope from the ship, the tensile force acting on the variable operating point of each expansion net can be adjusted to change the angle and / or the area of the expansion net of the trawl fishing gear with respect to the water flow. The expansion width of the mesh opening is adjusted by variably adjusting the strength of the water flow received by the inner surface of the expansion body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

1 to 8 show a trawl fishing gear 1 according to the present invention.
An example is shown and applied to a drag net for bottoming.

In FIG. 1 and FIG. 2 showing the whole, reference numeral 1 in the drawings is a drag net for bottoming, which is formed by a front net 2 and a rear cod net 3. Sleeve nets 4 are connected to the front of both sides of the net 2. A large number of floats 7, 7 are fixed to the head rope 6 forming the upper end of the net mouth 5 of the net 2, and a large number of ground bobbins are attached to the ground rope 8 forming the lower end of the net mouth 5. 9 and 9 are fixed. In the present embodiment, the conventional otter board is not used, and the tough warp merging member 12 is connected to the tips of the two left and right warps 10, 10 fed from the ship via swivels 11 with bearings. Has been done. The tough warp merging members 12 and the upper and lower end portions of the upstream end portions of the sleeve nets 4 are connected by the tough warps 13 and 13, respectively.

In contrast to the drag net 1 thus formed, in the present embodiment, it extends between the tidal cut-off portion at the leading edge of the sleeve net 4 and the portions near the downstream ends of the tough warps 13, 13. A rope net-shaped sinker 14 having a shape as shown in FIG. 3 is connected. Outside each sink 14 is provided an expanding body 15 having a shape as shown in FIGS. 4 and 5. The mesh body 15 is long in the vertical direction with an opening 18 formed only at the upstream end (the right end in FIGS. 4 and 5) by an inner cloth 17a and an outer cloth 17b made of a flexible material such as canvas. It has a submerged wing portion 16 which is formed in a bag shape and which becomes a wing-like substantially rigid body shape by the water flowing in from the opening 18. A plurality of ribs 19, 19 for holding the wing-like substantially rigid body shape of the hydrofoil section 16
Are provided substantially horizontally between both fabrics 17a and 17b at predetermined intervals. Further, a substantially triangular stabilizer 20 is formed by projecting the inner side of every other rib 19 from the ribs 19 at both ends to the inside of the inner member 17a. This stub riser 20 automatically sets and holds the water attack angle of the hydrofoil 16. The rib 19 and the stabilizer 20 are made of a flexible material such as canvas. Further, the ribs 19 and the stabilizers 20 may be formed of a rigid body such as metal or reinforced plastic, if necessary. A desired number (three in this embodiment) of through holes 1 is formed in each rib 19 in the middle portion.
9a, 19a ... Are drilled. The expansion body 15 formed in this manner is provided on the outer side portion of the sink 14 such that the downstream edge of the hydrofoil portion 16 and the stabilizers 20.
The inner edges of the are fixed by a connecting method such as sewing. In addition, a ring 22 serving as a movable contact of the expansion body 15 is provided at a central portion in the vertical direction of the downstream end of the expansion body 15.
It is fixed so as to come out to the inside of the sink 14.
Further, at the downstream end of the lifting rope 23 fed out from the ship for adjusting the opening degree of the net mouth 5 of the dragnet 1, one winding rope 24 penetrating the both rings 22, 22 is provided. At the intermediate position between the left and right expansion nets 15, 15,
A hollow float 25 is inserted. The angle and area of the expansion net 15 with respect to the water flow are variably adjusted according to the length of the lifting rope 23 fed out. In the vicinity of the upper and lower ends of each sleeve net 4, a float 26 and a sink 27 for spreading the expansion net 15 are fixed. Further, a sinker 28 may be attached to the tough warp merging member 12 if necessary. In addition, a swivel or a snap ring for removing twist and various known connecting members may be used in the middle of each connecting portion or each portion of each component.

Next, the operation of this embodiment will be described.

First, when the dragnet 1 etc. on the ship is cast into water, the nets are cast in order from the part of the cod net 3 of the dragnet 1. In this embodiment, a large and heavy otter board is used. Therefore, the work is extremely safe and easy.

In the dragnet 1 cast in water, the expansion nets 15 and the sinkers 27 normally stretch the expansion nets 15 in the vertical direction as shown in FIG. Then, each expansion body 15 receives a water flow, and both side portions of the dragnet 1, that is, both sleeve nets 4 and 4, go away from each other by the outward component of the external force, and the net mouth 5 expands. Being done. In particular, in the present embodiment, since each expansion body 15 has the bag-shaped hydrofoil portion 16, the expansion operation of the opening 5 is rapidly performed. That is, immediately after being put into the water, the water flow flows from the opening 18 at the upstream end between the inner cloth 17a and the outer cloth 17b of each expansion net 15, and the hydrofoil 1
6 is inflated to have a wing-like substantially rigid body shape, and at the same time, after the plurality of stabilizers 20, 20, ... Are put into the water, the angle of attack against water is automatically set to a predetermined value early. Since a stable posture is maintained, a net-expanding force is generated in each net-expansion body 15, and the dragnet 1 rapidly expands the net mouth 5. As a result, in the present embodiment, the dragnet 1 can be quickly spread to the operable state. Further, in the expansion body 15 of the present embodiment, the plurality of ribs 19, 19, ... Are provided inside the hydrofoil portion 16, so that the wing-like shape is reliably maintained. Therefore, according to the expansion net 15 of this embodiment, an extremely large expansion force is applied to the dragnet 1 at an early stage.

In this embodiment, as shown by the solid line in FIG. 6, in the initial state, if the lifting rope 23 is extended to such an extent that the winding rope 24 is loosened, the stabilizers 20 cause the hydrofoil portions 16 to move. The angle of attack against water is maintained at a desired constant angle and equilibrium is achieved.

To further adjust the size of the net mouth 5 from this equilibrium state, it is extremely easy to wind the lifting rope 23 on the ship. That is, FIG.
7 and the lifting rope 2 as shown in FIG.
When 3 is wound up, the winding rope 24 pulls up each ring 22 portion to the upstream side, so that the expansion body 15 is deformed so as to pull up the central portion in the vertical direction of the downstream edge with the ring 22 to the upstream side. , The angle and area with respect to the water flow can be expanded from the equilibrium state in the initial state. As a result, the expansion force of each expansion body 15 is increased, and the mesh opening 5 of the dragnet 1 is expanded. Therefore, as shown in FIG. 6, by adjusting the feeding length of the lifting rope 23, the angle of each expansion net 15 with respect to the water flow can be varied from the initial position of the solid line in the figure to the maximum expansion force position of the chain line. By adjusting, the opening degree of the net mouth 5 of the dragnet 1 can be freely adjusted. In this case, since the pulling force is applied from the downstream end of the lifting rope 23 through the winding rope 24 that is branched in a bifurcated manner, the same degree of opening adjustment force is applied to each expansion body 15. Therefore, both sleeve nets 4 and 4 of the dragnet 1 are opened and closed symmetrically with respect to the advancing direction, and the advancing direction of the dragnet 1 does not change.

When the net mouth 5 of the dragnet 1 is closed in order to search for a school of fish not caught or to move to the position of the found school of fish at a high speed, the lifting rope 23 is further added as shown by the solid line in FIG. When it is wound and the inner surface of each expansion net 15 is orthogonal to the water flow, the expansion force of each expansion net 15 disappears, and the drag net 1 gradually closes the net opening 5. By thus towing the dragnet 1 with the minimum water resistance, it is possible to move at high speed and to reduce fuel consumption.

[0021] In addition, the operation of lifting nets such as the dragnet 1 on the ship is
It is extremely easy to perform in the reverse process of casting.

The expansion net 15 is attached to the dragnet 1 at a desired position near the upstream end of the sleeve net 4 or further upstream thereof by utilizing the pour-off sink 14 and the connecting rope or the dragnet 1. It may be changed to a desired position such as an upper part or a bottom part of itself according to the purpose of use.

Further, the present invention can be similarly applied to a drag net for drawing the middle layer.

Further, the present invention is not limited to the above-mentioned embodiment, but can be modified as necessary.

[0025]

As described above, since the net-expansion body and the trawl fishing gear of the present invention are constructed and operate, the angle of attack against water can be set and maintained without using the bridle wire, and the handling is extremely easy. By adjusting the feeding length of the lifting rope from the ship, it is possible to freely adjust the net expansion force and, moreover, appropriately adjust the expansion width of the net opening of the dragnet according to the purpose of the fishery. Further, when the boat moves at a high speed, there is an effect that the mesh opening of the dragnet can be closed to greatly reduce the running water resistance.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing one embodiment of a trawl fishing gear of the present invention

FIG. 2 is an enlarged side view of the essential parts of the fishing gear of FIG.

[Fig. 3] Plan view of the sink

FIG. 4 is a perspective view of the expansion net.

5 is an enlarged cross-sectional view taken along the line VV of FIG.

FIG. 6 is a plan view showing how the fishing gear of FIG. 1 is used.

FIG. 7 is a perspective view showing a deformed state of the expansion body.

FIG. 8 is a plan view showing another usage mode of the fishing tackle of FIG. 1.

[Explanation of symbols]

 1 Drag net 5 Net mouth 15 Expanding net 16 Hydrofoil 23 Lifting rope 24 Winding rope

Claims (3)

[Claims] 1. A net-expanding body having a hydrofoil portion which is formed of a flexible member into a bag shape having an opening at an upstream end thereof and which has a substantially rigid wing-like shape due to water flowing from the opening. 2. The expansion net according to claim 1, further comprising a rib that holds the wing-like substantially rigid body shape of the hydrofoil and a stabilizer that holds the angle of attack of the hydrofoil against water. . 3. A bag-like member having an opening at the upstream end formed by a flexible member at a predetermined position in the vicinity of the upstream end of the dragnet and at a portion upstream thereof, and has a wing shape due to water flowing in through the opening. The trawl fishing gear is characterized in that the expansion net body having a hydrofoil portion having a substantially rigid body is disposed.